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Author Topic: photo resistor as switch  (Read 3728 times)

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Offline tipsy13Topic starter

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photo resistor as switch
« on: February 20, 2008, 08:13:09 AM »
im currently making a project that will use a photoresistor sensor to act as a switch to drive a stepper motor.basically what my machine will do is the when sunlight hits the sensor,the stepper motor will move clockwise and when there is no sunlight the motor will move counter-clockwise. i will also use an mts 88.c microprocessor trainer and an I/O board 4 for this. but my main concern is how will i make the photoresistor act as a switch?

im a noob here and i cant seem to find any article about this anywhere..thanks alot guys..
« Last Edit: February 20, 2008, 08:15:20 AM by tipsy13 »

Offline 555 timer chip guy

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Re: photo resistor as switch
« Reply #1 on: February 20, 2008, 01:15:59 PM »
Try a transistor and a relay also I have a circuit if you would like it that outputs a pules.

Offline airman00

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Re: photo resistor as switch
« Reply #2 on: February 20, 2008, 02:07:02 PM »
comparator and photoresistor


search the forum for comparator , i have already explained it here to someone else
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline tipsy13Topic starter

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Re: photo resistor as switch
« Reply #3 on: February 20, 2008, 07:18:29 PM »
im kinda lost here..so i should use a comparator?cant i just hook it up to the mts 88.c and make the photoresistor send a pulse ?555timer guy,a circuit would really help me..tnx

Offline airman00

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Re: photo resistor as switch
« Reply #4 on: February 20, 2008, 07:43:18 PM »
Check out the Roboduino, Arduino-compatible board!


Link: http://curiousinventor.com/kits/roboduino

www.Narobo.com

Offline 555 timer chip guy

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Re: photo resistor as switch
« Reply #5 on: February 20, 2008, 09:51:12 PM »
im kinda lost here..so i should use a comparator?cant i just hook it up to the mts 88.c and make the photoresistor send a pulse ?555timer guy,a circuit would really help me..tnx

Here is a circuit that uses a comparator. It will give you a plain digital signal 1 or 0. 0 for light hitting the sensor and 1 for darkness and the 10k pot determines the threshold.

 


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